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Discussion Starter · #1 ·
2004 2500 hd. Changed from 245/75/16 to 265/70/17. Per Miata.net tire size calculator and gps was 2mph off at 60 on speedo actual 62 mph. Speedo was correct before rim/tire change. Took to local dealer and thay said they made changes to correct rim/tire size but speedo is still the same. Dealer stated cannot do anything about it because it is a diesel. Anyone heard of this ? I thought it could be corrected. I know 2mph is not that far off but would like it to read properly.
 

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Former GM Tech and parts
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You should be able to change it with a quality tuner. I know that I can with my PPE, and also with the Predator thats on my wifes truck.
 
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